Digest for sci.electronics.repair@googlegroups.com - 6 updates in 2 topics

captainvideo462009@gmail.com: May 25 08:08AM -0700

I apologize if part of this seems off topic but I thought that the electronic component of it might be on. I have this 3.5 horse engine on my old push mower. The engine is about 38 years old now but the mower is used very infrequently so the hours are not that bad. About 5 or 6 years ago I replaced the old OEM coil that used points, with a used newer electronic type that eliminates the points. The mower is on it's third carburetor, gas tank and second deck but it has always started ok. I tried to start the mower this morning and as sure as my wife said, (I hate it when she's right), "You'll never start that old thing", it wouldn't start. Long story short there is no HV spark to the plug. It seems as though the coil is bad again. I was going to hit up a few used lawnmower places to try to get a replacement coil because I have no engine numbers on my machine to look up the part but I was wondering if anyone knows if it's possible to bench test these things. Thanks for any help Lenny
tabbypurr@gmail.com: May 25 08:22AM -0700


> I apologize if part of this seems off topic but I thought that the electronic component of it might be on. I have this 3.5 horse engine on my old push mower. The engine is about 38 years old now but the mower is used very infrequently so the hours are not that bad. About 5 or 6 years ago I replaced the old OEM coil that used points, with a used newer electronic type that eliminates the points. The mower is on it's third carburetor, gas tank and second deck but it has always started ok. I tried to start the mower this morning and as sure as my wife said, (I hate it when she's right), "You'll never start that old thing", it wouldn't start. Long story short there is no HV spark to the plug. It seems as though the coil is bad again. I was going to hit up a few used lawnmower places to try to get a replacement coil because I have no engine numbers on my machine to look up the part but I was wondering if anyone knows if it's possible to bench test these things. Thanks for any help Lenny
 
shouldn't be hard to continuity test the coil LT & HT sides. You have a multimeter?
 
Beware, connecting & disconnecting the meter on the LT side can cause a spark on the HT side.
 
 
NT
"Charles" <charlesschuler@comcast.net>: May 24 01:26PM -0400

Just finished working on this old beast. The display was flashing,
indicating an open amplitude control loop. The output vernier had no
effect. There is an op-amp error amp and it is socketed (741) so that was
easy to try first. No joy. Looking at the schematic it seemed the peak
detector diodes would be easy to check. Turns out that they are under two
covers but still not too hard. One cover is glued down but was easy to pry
off. One diode was open. I tacked in a 1N914/1N4148 substitute and
amplitude control was regained and no more flashing display. The output at
250 MHz is within 1 dB. Not too bad.
 
To fix it right, I am looking at a MMBD452LT1G.
Look165 <look165@numericable.fr>: May 24 07:53PM +0200

A 1N4148 will never be able to work at 250MHz.
 
Rtaher try 1N3595 or equivalent.
 
Charles a écrit :
Phil Allison <pallison49@gmail.com>: May 24 09:53PM -0700

Look165 wrote:
 
> A 1N4148 will never be able to work at 250MHz.
 
**
 
> Rtaher try 1N3595 or equivalent.
 
** Err - that is a very slow, low leakage diode.
 
 
... Phil
Phil Allison <pallison49@gmail.com>: May 24 10:00PM -0700

Charles wrote:
 
 
> To fix it right, I am looking at a MMBD452LT1G.
 
** That is a dual Schottky.
 
http://www.onsemi.com/pub/Collateral/MMBD452LT1-D.PDF
 
 
Readily available and cheap enough:
 
https://www.digikey.com.au/product-detail/en/on-semiconductor/MMBD452LT1G/MMBD452LT1GOSCT-ND/3462360
 
 
... Phil
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Digest for sci.electronics.repair@googlegroups.com - 4 updates in 3 topics

praneeth.budlu@gmail.com: May 24 07:32AM -0700

Please
Solution Manual Electronic Principles (8th Ed., Albert Malvino, David Bates)
Praneeth.budlu@gmail.com
danseressen@gmail.com: May 23 09:42PM -0700

for more info go to: http://www.hiltoncuracao.com
 
Amazing villa, Studio Acht architecture, with incredible view of the Caribbean sea. Located at the gated community Cas Abou. Since the villa is located relatively high there is always a cool, fresh breeze. The 900 square meters of private land are completely walled and have an iron gate by Mexico Lindo. The fantastic garden with various plants like palm trees, melon plants, cacti and blossoming bougainvilleas is watered automatically by a dripping system directly connected to the private water tank inside the house.
 
Located on the highest point of Cas Abou Curacao
Breathtaking view of the sea and mountains
Always a cool and fresh breeze because of the location
900 square meters of private land
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Large private water tank filling up with rainwater
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Automatic gate, design by Mexico Lindo, with remote
Swimming pool(9m X 4M) and Jacuzzi
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carport
 
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"pfjw@aol.com" <peterwieck33@gmail.com>: May 24 04:00AM -0700

All good, but for the fact that it is in Mexico. All safe when "at home" - but getting to and from could be interesting.
 
Be sure to update your kidnap insurance, and get your life-insurance endorsed for Mexico.
 
Costa Rica is not that much further, by the way.
solutions.for.student@gmail.com: May 24 03:55AM -0700

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Digest for sci.electronics.repair@googlegroups.com - 3 updates in 1 topic

Charlie+ <charlie@xxx.net>: May 21 06:14PM +0100

On Mon, 21 May 2018 08:05:30 -0700 (PDT), tabbypurr@gmail.com wrote as
underneath :
 
 
>I'm happy to prefer NiCd/NiMh when available. Seems the OP has caused his own problem.
 
>A current limiting transistor stage could fix it, but going NiMH would surely be easier.
 
Not a chance - we are replacing wet Lead acid type power! Original Pb.
battery just wore out quite quickly .. C+
Charlie+ <charlie@xxx.net>: May 21 06:22PM +0100

On Mon, 21 May 2018 10:30:39 -0400, Bob Engelhardt
>discharged through the base in a few seconds when on. But I'm much too
>transistor illiterate to be more specific. Try S.E.Basics or S.E.Design
>if you don't get help here.
 
OK Bob thanks for thaughts, think I might just have a start button and
release once running. Thats cheap and cheerful, Ill report if it works
ok. C+
Charlie+ <charlie@xxx.net>: May 21 08:33PM +0100

On Mon, 21 May 2018 18:22:34 +0100, Charlie+ <charlie@xxx.net> wrote as
underneath :
 
 
>OK Bob thanks for thaughts, think I might just have a start button and
>release once running. Thats cheap and cheerful, Ill report if it works
>ok. C+
Ok Done and dusted - instant-on press button works fine (just bypasses
the BMS negative on startup) - time will tell if it keeps on happily
trucking! Thanks for help everyone... C+
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